Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | // SPDX-License-Identifier: GPL-2.0+ /* * Bootmethod for distro boot via EFI * * Copyright 2021 Google LLC * Written by Simon Glass <sjg@chromium.org> */ #define LOG_CATEGORY UCLASS_BOOTSTD #include <common.h> #include <bootdev.h> #include <bootflow.h> #include <bootmeth.h> #include <command.h> #include <dm.h> #include <efi_loader.h> #include <fs.h> #include <malloc.h> #include <mapmem.h> #include <mmc.h> #include <pxe_utils.h> #define EFI_DIRNAME "efi/boot/" /** * get_efi_leafname() - Get the leaf name for the EFI file we expect * * @str: Place to put leaf name for this architecture, e.g. "bootaa64.efi". * Must have at least 16 bytes of space * @max_len: Length of @str, must be >=16 */ static int get_efi_leafname(char *str, int max_len) { const char *base; if (max_len < 16) return log_msg_ret("spc", -ENOSPC); if (IS_ENABLED(CONFIG_ARM64)) base = "bootaa64"; else if (IS_ENABLED(CONFIG_ARM)) base = "bootarm"; else if (IS_ENABLED(CONFIG_X86_RUN_32BIT)) base = "bootia32"; else if (IS_ENABLED(CONFIG_X86_RUN_64BIT)) base = "bootx64"; else if (IS_ENABLED(CONFIG_ARCH_RV32I)) base = "bootriscv32"; else if (IS_ENABLED(CONFIG_ARCH_RV64I)) base = "bootriscv64"; else if (IS_ENABLED(CONFIG_SANDBOX)) base = "bootsbox"; else return -EINVAL; strcpy(str, base); strcat(str, ".efi"); return 0; } static int efiload_read_file(struct blk_desc *desc, struct bootflow *bflow) { const struct udevice *media_dev; int size = bflow->size; const char *dev_name; char devnum_str[9]; char dirname[200]; char *last_slash; int ret; ret = bootmeth_alloc_file(bflow, 0x2000000, 0x10000); if (ret) return log_msg_ret("read", ret); /* * This is a horrible hack to tell EFI about this boot device. Once we * unify EFI with the rest of U-Boot we can clean this up. The same hack * exists in multiple places, e.g. in the fs, tftp and load commands. * * Once we can clean up the EFI code to make proper use of driver model, * this can go away. */ media_dev = dev_get_parent(bflow->dev); snprintf(devnum_str, sizeof(devnum_str), "%x", dev_seq(media_dev)); strlcpy(dirname, bflow->fname, sizeof(dirname)); last_slash = strrchr(dirname, '/'); if (last_slash) *last_slash = '\0'; log_debug("setting bootdev %s, %s, %s, %p, %x\n", dev_get_uclass_name(media_dev), devnum_str, bflow->fname, bflow->buf, size); dev_name = device_get_uclass_id(media_dev) == UCLASS_MASS_STORAGE ? "usb" : dev_get_uclass_name(media_dev); efi_set_bootdev(dev_name, devnum_str, bflow->fname, bflow->buf, size); return 0; } static int distro_efi_check(struct udevice *dev, struct bootflow_iter *iter) { int ret; /* This only works on block devices */ ret = bootflow_iter_uses_blk_dev(iter); if (ret) return log_msg_ret("blk", ret); return 0; } static int distro_efi_read_bootflow(struct udevice *dev, struct bootflow *bflow) { struct blk_desc *desc = NULL; char fname[sizeof(EFI_DIRNAME) + 16]; int ret; /* We require a partition table */ if (!bflow->part) return -ENOENT; strcpy(fname, EFI_DIRNAME); ret = get_efi_leafname(fname + strlen(fname), sizeof(fname) - strlen(fname)); if (ret) return log_msg_ret("leaf", ret); if (bflow->blk) desc = dev_get_uclass_plat(bflow->blk); ret = bootmeth_try_file(bflow, desc, NULL, fname); if (ret) return log_msg_ret("try", ret); ret = efiload_read_file(desc, bflow); if (ret) return log_msg_ret("read", -EINVAL); return 0; } int distro_efi_boot(struct udevice *dev, struct bootflow *bflow) { char cmd[50]; /* * At some point we can add a real interface to bootefi so we can call * this directly. For now, go through the CLI like distro boot. */ snprintf(cmd, sizeof(cmd), "bootefi %lx %lx", (ulong)map_to_sysmem(bflow->buf), (ulong)map_to_sysmem(gd->fdt_blob)); if (run_command(cmd, 0)) return log_msg_ret("run", -EINVAL); return 0; } static int distro_bootmeth_efi_bind(struct udevice *dev) { struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev); plat->desc = IS_ENABLED(CONFIG_BOOTSTD_FULL) ? "EFI boot from an .efi file" : "EFI"; return 0; } static struct bootmeth_ops distro_efi_bootmeth_ops = { .check = distro_efi_check, .read_bootflow = distro_efi_read_bootflow, .read_file = bootmeth_common_read_file, .boot = distro_efi_boot, }; static const struct udevice_id distro_efi_bootmeth_ids[] = { { .compatible = "u-boot,distro-efi" }, { } }; U_BOOT_DRIVER(bootmeth_efi) = { .name = "bootmeth_efi", .id = UCLASS_BOOTMETH, .of_match = distro_efi_bootmeth_ids, .ops = &distro_efi_bootmeth_ops, .bind = distro_bootmeth_efi_bind, }; |